[info] Using makefile-style concurrent boot in runlevel 2. [ 48.611175][ T26] audit: type=1800 audit(1575648160.363:21): pid=7351 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="bootlogs" dev="sda1" ino=2452 res=0 [ 48.668344][ T26] audit: type=1800 audit(1575648160.363:22): pid=7351 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="motd" dev="sda1" ino=2480 res=0 [....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.1.13' (ECDSA) to the list of known hosts. 2019/12/06 16:02:53 fuzzer started 2019/12/06 16:02:54 dialing manager at 10.128.0.105:42203 2019/12/06 16:02:54 syscalls: 2684 2019/12/06 16:02:54 code coverage: enabled 2019/12/06 16:02:54 comparison tracing: enabled 2019/12/06 16:02:54 extra coverage: extra coverage is not supported by the kernel 2019/12/06 16:02:54 setuid sandbox: enabled 2019/12/06 16:02:54 namespace sandbox: enabled 2019/12/06 16:02:54 Android sandbox: /sys/fs/selinux/policy does not exist 2019/12/06 16:02:54 fault injection: enabled 2019/12/06 16:02:54 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/12/06 16:02:54 net packet injection: enabled 2019/12/06 16:02:54 net device setup: enabled 2019/12/06 16:02:54 concurrency sanitizer: enabled 2019/12/06 16:02:54 devlink PCI setup: PCI device 0000:00:10.0 is not available 2019/12/06 16:02:54 adding functions to KCSAN blacklist: '__hrtimer_run_queues' syzkaller login: [ 62.831856][ T7501] ================================================================== [ 62.840049][ T7501] BUG: KCSAN: data-race in tcp_add_backlog / tcp_recvmsg [ 62.847057][ T7501] [ 62.849369][ T7501] write to 0xffff888120960138 of 8 bytes by interrupt on cpu 1: [ 62.857021][ T7501] tcp_add_backlog+0x476/0xce0 [ 62.861763][ T7501] tcp_v4_rcv+0x1a70/0x1bd0 [ 62.866246][ T7501] ip_protocol_deliver_rcu+0x4d/0x420 [ 62.871600][ T7501] ip_local_deliver_finish+0x110/0x140 [ 62.877040][ T7501] ip_local_deliver+0x133/0x210 [ 62.881868][ T7501] ip_rcv_finish+0x121/0x160 [ 62.886436][ T7501] ip_rcv+0x18f/0x1a0 [ 62.890399][ T7501] __netif_receive_skb_one_core+0xa7/0xe0 [ 62.896092][ T7501] __netif_receive_skb+0x37/0xf0 [ 62.901004][ T7501] netif_receive_skb_internal+0x59/0x190 [ 62.906611][ T7501] napi_gro_receive+0x28f/0x330 [ 62.911441][ T7501] receive_buf+0x284/0x30b0 [ 62.915925][ T7501] virtnet_poll+0x436/0x7d0 [ 62.920405][ T7501] net_rx_action+0x3ae/0xa90 [ 62.924974][ T7501] __do_softirq+0x115/0x33f [ 62.929452][ T7501] irq_exit+0xbb/0xe0 [ 62.933409][ T7501] do_IRQ+0x81/0x130 [ 62.937282][ T7501] ret_from_intr+0x0/0x19 [ 62.941588][ T7501] native_safe_halt+0xe/0x10 [ 62.946155][ T7501] arch_cpu_idle+0xa/0x10 [ 62.950460][ T7501] default_idle_call+0x1e/0x40 [ 62.955200][ T7501] do_idle+0x1af/0x280 [ 62.959245][ T7501] cpu_startup_entry+0x1b/0x20 [ 62.963985][ T7501] start_secondary+0x168/0x1b0 [ 62.968737][ T7501] secondary_startup_64+0xa4/0xb0 [ 62.973730][ T7501] [ 62.976038][ T7501] read to 0xffff888120960138 of 8 bytes by task 7501 on cpu 0: [ 62.983599][ T7501] tcp_recvmsg+0x46e/0x1b40 [ 62.988085][ T7501] inet_recvmsg+0xbb/0x250 [ 62.992479][ T7501] sock_recvmsg+0x92/0xb0 [ 62.996784][ T7501] sock_read_iter+0x15f/0x1e0 [ 63.001438][ T7501] new_sync_read+0x389/0x4f0 [ 63.006032][ T7501] __vfs_read+0xb1/0xc0 [ 63.010200][ T7501] vfs_read+0x143/0x2c0 [ 63.014333][ T7501] ksys_read+0xd5/0x1b0 [ 63.018466][ T7501] __x64_sys_read+0x4c/0x60 [ 63.022951][ T7501] do_syscall_64+0xcc/0x370 [ 63.027433][ T7501] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 63.033294][ T7501] [ 63.035598][ T7501] Reported by Kernel Concurrency Sanitizer on: [ 63.041740][ T7501] CPU: 0 PID: 7501 Comm: syz-fuzzer Not tainted 5.4.0-syzkaller #0 [ 63.049603][ T7501] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 63.059639][ T7501] ================================================================== [ 63.067681][ T7501] Kernel panic - not syncing: panic_on_warn set ... [ 63.074249][ T7501] CPU: 0 PID: 7501 Comm: syz-fuzzer Not tainted 5.4.0-syzkaller #0 [ 63.082111][ T7501] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 63.092143][ T7501] Call Trace: [ 63.095416][ T7501] dump_stack+0x11d/0x181 [ 63.099728][ T7501] panic+0x210/0x640 [ 63.103603][ T7501] ? vprintk_func+0x8d/0x140 [ 63.108176][ T7501] kcsan_report.cold+0xc/0xd [ 63.112749][ T7501] kcsan_setup_watchpoint+0x3fe/0x460 [ 63.118117][ T7501] __tsan_read8+0xc6/0x100 [ 63.122528][ T7501] tcp_recvmsg+0x46e/0x1b40 [ 63.127033][ T7501] inet_recvmsg+0xbb/0x250 [ 63.131427][ T7501] ? apparmor_socket_recvmsg+0x3b/0x50 [ 63.136866][ T7501] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 63.143087][ T7501] ? security_socket_recvmsg+0x92/0xb0 [ 63.148522][ T7501] ? inet_sendpage+0x100/0x100 [ 63.153267][ T7501] sock_recvmsg+0x92/0xb0 [ 63.157576][ T7501] sock_read_iter+0x15f/0x1e0 [ 63.162248][ T7501] new_sync_read+0x389/0x4f0 [ 63.166821][ T7501] __vfs_read+0xb1/0xc0 [ 63.170970][ T7501] vfs_read+0x143/0x2c0 [ 63.175184][ T7501] ksys_read+0xd5/0x1b0 [ 63.179341][ T7501] __x64_sys_read+0x4c/0x60 [ 63.183839][ T7501] do_syscall_64+0xcc/0x370 [ 63.188332][ T7501] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 63.194202][ T7501] RIP: 0033:0x47c530 [ 63.198128][ T7501] Code: 8b 7c 24 10 48 8b 74 24 18 48 8b 54 24 20 49 c7 c2 00 00 00 00 49 c7 c0 00 00 00 00 49 c7 c1 00 00 00 00 48 8b 44 24 08 0f 05 <48> 3d 01 f0 ff ff 76 20 48 c7 44 24 28 ff ff ff ff 48 c7 44 24 30 [ 63.217713][ T7501] RSP: 002b:000000c4203dd810 EFLAGS: 00000202 ORIG_RAX: 0000000000000000 [ 63.226106][ T7501] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 63.234071][ T7501] RDX: 0000000000001000 RSI: 000000c4203f6000 RDI: 0000000000000003 [ 63.242038][ T7501] RBP: 000000c4203dd868 R08: 0000000000000000 R09: 0000000000000000 [ 63.250002][ T7501] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000003 [ 63.257954][ T7501] R13: 000000c420020600 R14: 0000000000000002 R15: ffffffffffffffff [ 63.267257][ T7501] Kernel Offset: disabled [ 63.271641][ T7501] Rebooting in 86400 seconds..